Cushion stone



FIG. 1 is a top, front, and right side perspective view of a cushion stone;

FIG. 2 is a bottom, rear, and left side perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof; and

FIG. 5 is a left side view thereof, the right side view being a mirror image thereof; and,

FIG. 6 is a front side view thereof, the rear side view being a mirror image thereof.

The broken lines in FIGS. 1, 2, 4, 5, and 6 depict portions of the cushion stone that form no part of the claimed design. 

CLAIM We claim the ornamental design for a cushion stone, as shown and described. 